Mms: General translation cleanup

Patch Set 1:    * remove unneeded strings
                * reorder strings
                * Copyright cleanup
                * make 'dark theme' only choosable if
                  QM is enabled

Patch Set 2:    * revert 'dark theme' repositioning
                * rename strings after comments

Change-Id: Ifee8227cad8b1093997334d2af5867e943a6be46
Merge "Mms: General translation cleanup" into cm-10.1
Merge branch 'cm-10.1' of github.com:CyanogenMod/android_packages_apps_Mms into cm-10.1